Have a thinkpad X1 Carbon Pro and have run fedora, ubuntu and Qubes OS on it at various points. Have Ubuntu on it now (as that's the distro my company wants everyone to use). In all of those distros the install has been completely trouble-free and everything works completely fine.
Also I don't use wayland and don't have the scaling perf problem that someone else was talking about.
Have an X1 Yoga here with Arch on it, it was painless.
Bought an X390 for my mom last year, tossed Ubuntu on it after putting in a larger NVMe. (she prefers to use a more 'mainstream' distro so she can follow tutorials to setup new dev environments for things she's tinkering with) Her Macbook Air is weighing down paper now.
